When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?

A.
stable factors

B.
frictional force

C.
a balanced set of forces

D.
unbalanced forces

Question

When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?	
 
 A.
stable factors
 
 B.
frictional force
 
 C.
a balanced set of forces
 
 D.
unbalanced forces

anonymous · Answer

please help

matt101 · Answer

The answer is D. The question is asking you about NEWTON'S FIRST LAW, which states:

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an UNBALANCED FORCE.